Process for refining 1,3-dimethyl-2-imidazolidinone
US5011936A · kind A · utility
3Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Mar 7, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/32
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to a refining process for removing impurities from 1,3-dimethyl-2-imidazolidinone (DMI) by the use of a composite salt; and a process for preparing an aromatic polyamide having a high polymerization degree from an aromatic diisocyanate and an aromatic dicarboxylic acid by using, as a reaction solvent, DMI purified by the above-mentioned process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.